Earth
Various sciences that study the Earth, either as a physical entity, or as a living environment for plants, animals and human beings.
ENVIRONMENT
Collective term for the elements that surround a living organism, some of which contribute directly to meeting its needs.
hydrologic cycle
Continuous circulation of water in its different states (liquid, solid and gaseous) between the oceans, the atmosphere and the Earth’s surface.
greenhouse effect
Warming of the atmosphere that occurs when certain gases absorb part of the solar radiation reflected by the Earth.
air pollution
The presence in the atmosphere of large quantities of particles or gases produced by human activity; these are harmful to both animal and plant life.
land pollution
Numerous factors contribute to soil pollution (e.g., household and industrial waste, fertilizers, pesticides).
